[CHANGE] compatibility for Alliance Auth v5 and remove v4 support

[Geuthur]

Description

Changed

• compatibility for Alliance Auth v5 and remove v4 support
• Updated dependencies to require Alliance Auth v5
• Adjusted README and changelog to reflect new compatibility
• Removed obsolete settings files for Alliance Auth v4
• Updated test environment configurations

Type of Changes

Please select the type of changes made in this pull request:

• Bug Fix (non-breaking change which fixes an Issue)
• New Feature (non-breaking change)
• Other (please specify):

Checklist

Please ensure the following before submitting your pull request:

• I have read the contributing guidelines.
• My code follows the code style of this project.
• I have performed a self-review of my code.
• I have commented my code where necessary.
• All new and existing tests passed.

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